NDSNews:2006-12-20 - DS Motion Card for Homebrew
From Dev-Scene
The DS Motion Card
The DS Motion Card is a revolutionary motion sensor for the DS and DS Lite handheld gaming systems - It is the first tri-axis accelerometer that can be used for homebrew DS development, and the first and only accelerometer/gyroscope combination available for handheld gaming.
The DS Motion Card contains a Kionix tri-axis accelerometer and single-axis gyroscope that communicate with the DS using SPI (Serial Peripheral Interface) on the DS card. The accelerometer measures acceleration in all directions (both gravitational acceleration and acceleration caused by a change in velocity). The gyroscope measures angular rotation rate (speed of rotation) around an axis perpendicular to the bottom screen of the DS.
Custom software turns the sensors on, reads the accelerations and angular rate, and controls the display based on the sensor readings. Functions to communicate with the sensors have already been written and are simple to integrate into any existing or new projects.